The Preparation, Characterization And Application Of The Bionic Surface Materials

Many excellent natural superhydrophobic surfaces in nature have attracted moreand more attention of material scientists. A lot of investigation results have shownwhich superhydrophobicity of solid material surface mainly depends on a micro-nano composite roughness of the solid surface and low surface energy simultaneously.How to imitate these wonderful natural structures, to successfully prepare thesuperhydrophobic materials similar to the natural surface in the laboratory, and at lastto achieve their industrial production and application has become a focus of study inmaterial science in recent years.In this thesis, some new bionic superhydrophobic surfaces were preparedthrough analyzing, mimicking and rebuilding natural superhydrophobic plant surfaces.It consists of three parts as follows:1. Micro/nanometric structure of rose petal surface was successfully copied by aPDMS soft shaping technique. A new biaonic-recreation superhydrophobic surface,with more excellent micro/nanometric roughness and wettabilities than nature rosepetal surface and the surface obtained through traditional micro-contact printingmethod, was obtained based on addition and post-treatment of namoscale Fe₃₄particles during the production of PDMS stamp, and the contact angle reached1690.Prepared PDMS-Fe₃₄stamp can be re-used many times. Surface morphology andcomposition of the prepared stamp were studied by scanning electronmicroscopy（SEM） and X-ray energy dispersive spectrometer（XDS） in detail.2. The traditional method for preparing nanometric silica particles was improvedby adding ethyl orthosilicate many times. Well-define and uniform size of silicaparticles were obtained through controllable and full hydrolysis of ethyl orthosilicate。3. Micron-sized rod-like ZnO particles was prepared in situ on the slide treatedwith Piranha solution by a seed growing method, then the spherical silicananoparticles were grafted on the rod-shaped ZnO by electrostatic adsorption. As aresult, a barbados aloe-like structure of ZnO/SiO₂micro-nanoscale structure with excellent superhydrophobicity was successfully fabricated. Experimental conditionswere optimized and it was found that250nm SiO₂nanoparticles could induce thehighest hydrophobicity. The prepared surface had a good anti-icing performance. Thesuperhydrophobic mechanism was also studied based on Cassie model.